HMC478ST89

Series:	--
Packaging:	Cut Strip
Part Status:	Obsolete
Frequency:	0Hz ~ 4GHz
P1dB:	18dBm
Gain:	22dB
Noise Figure:	3dB ~ 4dB
RF Type:	General Purpose
Voltage - Supply:	5 V ~ 8 V
Current - Supply:	62mA
Test Frequency:	--
Package / Case:	TO-243AA
Supplier Device Package:	SOT-89
Base Part Number:	HMC478

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RF Amplifiers

The HMC478ST89 is an RF amplifier designed for low-noise, wideband operation over the frequency range from 4 to 8GHz. This amplifier offers excellent gain and linearity as well as low noise and low input return loss. It is typically used for wideband low-noise amplifying in medical, commercial, instrumentation, military, and communication systems.

Application Field

The HMC478ST89 is suitable for a variety of systems where low-noise wideband amplification is needed. It is commonly used in wireless communication systems such as 4G and LTE, automotive radar systems, satellite communication systems, medical imaging systems, and industrial systems. It has been used in base stations, repeater and distributed antennas systems (DAS) where high-quality signals are needed over a wide frequency. Additionally, this amplifier is used for linear amplification in satellite communication, remote sensing, and tactical communication systems.

Working Principle

The HMC478ST89 is a GaAs monolithic IC (MMIC) based on a single stage, low noise amplifier (LNA). It operates on a voltage of 5V and consumes 20mA of current. The amplifier consists of a field-effect transistor (FET) configured as common source mode. The FET generates its gain primarily from the transconductance of its gate-drain junction. To provide wideband, low-noise performance, the amplifier has been designed with a high frequency bandwidth and a low noise figure.The HMC478ST89 applies a two-level gate voltage to the FET, allowing it to maintain low noise on the output side. The gate voltage is adjustable, allowing the gain of the amplifier to be set depending on the situation. The other two electrical connections are power supplies for the amplifier, which are typically +6 and -6 volts.The HMC478ST89 has a relatively high gain; typically, it can provide up to 14dB gain in the frequency range of 4 to 8GHz. Additionally, this amplifier offers very low noise figure, with values of only 1.3dB typical being achievable. The output match of the amplifier is also excellent, at greater than 10dB.

Conclusion

The HMC478ST89 is an ideal choice for a wide range of low-noise wideband applications. This amplifier offers high gain, wide bandwidth, excellent linearity, low noise and low return loss, making it suitable for use in a wide variety of systems. As a result, the HMC478ST89 is widely used in medical, commercial, instrumentation, military, and communication systems.

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